andrews



(No Model.) 2 Sheets-Sheet 1. E. N. ANDREWS. THREAD CUTTING AND DRILLINGMACHINE.

Patented May 13, 1890 2 Sheets-Sheet 2. D. N. ANDREWS. THREAD CUTTINGAND DRILLING.MAGHINE. No. 427,948.

(No Model.)

Patented May 13, 1890.

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UNITED STATES PATENT OFFICE.

EDWVARD N. ANDREIVS, OF NElV YORK, N. Y.

THREAD-CUTTING AND DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 427,948, dated May 13,1890. v

Application filed October 3, 1887. Serial No. 251,344. (No model.)

T0 all whom. it may concern.-

Be it known that I, EDWARD N. ANDREws, a citizen of the United States,and a resident of New York, in the county and State of New York,haveinvented new and useful Improvements in Thread-Cutting and DrillingMachines, of which the following is a specification.

My invention relates to machines for drilling and tapping holes andcutting screwthreads, and has for its object to obviate disadvantages ofsimilar machines as heretofore made and to effect all the advantagesobtained by the screw-threading machine patented to me April 23, 1885,No. 316,720, without entailing the expense necessary for thatconstruction.

The invention will be hereinafter described with reference to theaccompanying two sheets of drawings, in which Figure 1 represents a planview of my improved thread-cutting and drilling machine, the frame beingbroken out to reduce the width for gaining space on the drawin Fig. 2 isa front elevation of the same. Fig. 3 is an end elevation of the sameseen in the direction indicated by arrow 1 of Fig. 2. Fig. 4is an endelevation,partly broken out, of the most preferred modification (markedMod. A) of the thread-cutting machine. Fig. 5 is a detail horizontalsection of the same, taken on the line a: a: of Fig. l. Fig. 6 is avertical section on the line .2 .e of Fig. 2 of one modification (markedMod. B of the thread-cut ting machine. Fig. 7 is a front elevation ofthe same, or as seen in direction of arrow 2 of Figs. 3 and 6. Fig. 8 isa plan view of Fig. (i. Fig. 9 is adetail section of the clutchingdevice, taken on the line y y of Fig. 3. Fig. 10 is an end elevation ofanother modification (marked Mod. 0) of the thread-cutting machine. Fig.11 is a detail section of the same, taken 011 the line to w of Fig. 10,showing a modification of the clutching device. Fig. 12 is a verticalsection, seen as in Fig. 6, of another modification (marked Mod. D ofthe thread-cutting machine. Fig. 13 is a detail section of the same onthe line "0 r of Fig. 12, showing another modification of the clutchingdevice.

Like letters of reference indicate corresponding parts in the severalfigures.

The machineframe consists of an upper and a lower cast-iron plate A A,respectively, secured together at suitable intervals by posts a. Thisframe is supported on a column a, having ways (R, in which is guided asliding table a on which the work to be operated upon is placed. Thistable should be nearly counterbalanced so as to remainnormally in itslowest position until raised, as required, to feed the work against thedrills in the usual manner when the drill-spindles are 01)- erated inthe usual manner when drilling holes.

On the lower frame-plate A are bearings a for the horizontal main shaftB, which is driven by belt 011 conepulleys b and transmits motion bycone-pulleys b and belt to cone-pulleys c keyed on a splinedcountershaft 0. This revolves in a bearing 0, stationary upon the frame-plate A, and another bearing 0, which is mounted on a plate D,adjustable horizontally and securable in position by bolts 6 inhorizontal grooves e in the frame-plates A A, said grooves havingundercut edges adapted to fit and receive the correspondingly-shapedheads of the bolts e (See Fig. 2.)

The plate D carries vertical bearings 01 for the drill-spindle (1, whoseupper end is geared to the counter-shaft C by miter-gears d (P, theformer being fixed upon the spindle and the latter splined to slide onthe shaft Qwhich its hub surrounds while revolving in the bean ing 0'.

E is a non-adj ustable drill-spindle mounted in stationary bearings inthe frame and is provided with a pulley e, by which and a quarter-turnedbelt b it receives motion directly from a pulley b on the main shaft B.WVhen several holes are to be bored at equal distances apart, it is onlynecessary to adjust the distance of the spindle d relatively to thespindle E, and by making the shaft 0 long enough it may be used to runseveral adjustable spindles, such as d, to simultaneously bore holes atdifferent distances apart.

K are the thread-cutting or tapping spindles, two of which are run fromeach bevelwheel, such as b Fig. 1, on the main shaft B. The motion maybe changed from right to left, or vice versa, by shifting the wheel 17to the position 1), (shown in dotted lines in Fig. 1,) or vice versa.The whetl 1) gears with a bevel-wheel F upon a shaft F, revolving in abearing f upon the lower frameplate A. Upon the shaft F is also secureda spur-wheel f, which meshes at opposite sides with two similar wheels Gupon shaftsg in bearings g. Each shaft 9 carries two bevelwheels II h ofdifferent sizes, (for slow motion in tapping and fast motion inunscrewing the tap, as in my patent above referred to,) which mesh withand revolve in opposite directions two bevel-wheels I J, which areprovided with clutch-jogs i j and revolve in vertical bearings in theframe-plates A A and are loose upon the threading-spindle K. The spindleK is free to slide vertically to any depth regulated by an adjustablecollarN upon the spind le, which collar when the proper depth has beenreached disengages a stop and releases a set-spring, which shifts theclutch and reverses the motion, thus unscrewing the tap. A hand-lever Q,pivoted at r to a sleeve It, swiveled upon the spindle K, and whichlever is fulcrumed by a pivotal link q to the upper frame-plate A, andis used to depress the spindle to enter and start the tap in the hole tobe threaded, and the weight of the spindle is counterbalanced by aweight upon the off end of the hand-lever Q. The spindle K is eithersolid and provided with a spline 7t, Figs. 9 and 6, by which it slideson a key p, secured to a clutch-sleeve P, surrounding the spindle,or thespindle is tubular and provided with long slots k throughdiametrically-opposite sides, as in Figs. 10, 11,12, and13,thc key 11passing through the said slots andin to opposite sides of theclutch-sleeve P, while being rigidly secured in a diametrical slot in arod S within the hollow spindle, as in Figs. 12, 4, and 10. The clutchis carried by a reversin g-bar L, which is sliding in the frame parallelwith the spindle, the connection being made either by a bearingin twohalves surrounding thesleeve P and bolted tothc bar L, as in Figs. 6 and12, or by making the short inner rod S, Fig. 12, long enough to projectabove the hollow spindle and swiveling its upper end to an overhangingupward prolongation of the bar L, as in Figs. 4 and 10. A lever M,provided with a dog m to engage the collar N and with a catch a toengage a keeper n in the frameplate A, is pivoted in a slot in the bar Land kept by a spring 1' upon the bar normally pressed toward the keeper72 (see modifications B C 1),) and a spiralspring Z, Fig. 7, attachedwith its lower end to a pin upon the bar L and with its upper end to theframeplate A, raises the bar L (when the collar N has descended with thespindle far enough to push aside the dog m, and thcrebydiscngage thelever M from the kcepcrn) and shifts the clutch attached to the bar fromthe lower wheel .I to the upper wheel I, thus reversing the motion andwithdrawing the tap from the threaded hole. It will be noticed that inthe just-described reversing device the clutch is raised solely by theforce of the spring I.

This works well for small tapssay not over one-half inch; but for largertaps the friction between the key 1') and the spindle is so great as tomake the springl wholly inoperative. For all larger sizes, therefore, Iuse the preferred modification A, (shown in Figs. 4 and 5,) in which onthe downward movement the spindleis run from the upper wheel I and theclutch in reversing is drawn out of contact with the jogs i on saidwheel by the power which runs the spindle and by the whole strength ofthe threads on the tap, and, on being thus released and all frictionremoved from the key 1), is thrown by the spring Z down into position tobe engaged by the jogs 7' on the lower wheel .I. For this purpose thelever M (see Figs. 4 and 5) is fulcrumed to the frame-plate A and has aperforated enlargement by which it loosely surrounds the spindle K andworks with its handle end in a slot in the bar .L, (or a slot in thelever M works on a pin in bar L,) so as to allow of a play at on.between them sufficient to raise the beveled end of the dog m (attachedto the lever M) from the corrcspomllingly-beveled end of a bolt or catch0, which latter slides in a socket in the frame-plate A and is held by aspiral spring 0 normally outward to engage the keeper n, this being inthe bar L instead of in the frame, before shown. The spring Z isattached to the lower frameplate A instead of to the upper. The end ofthe bolt 0 is slotted to receive the dog on, as shown in Fig. 5. The barL being locked upon the bolt 0, the lever M raised to only bring the dogm out of contact with the bolt, and the collar N set to give the properdepth, and the tap being entered into the hole to be threaded, thecollar N will at the proper moment depress the lever M and cause the dog77?- to disengage the bolt 0 from the bar L, thus setting the spring lfree to pull down the bar L, rod S, and clutclrkey p, attached to thelatter rod, into contact with the lower jogs j just as soon as thedownward-moving th reading-tap has drawn the clutch away from the upperjogs 'i; but for this modification it is not important to include thesetting-catch and tripping-dog for bar L, nor the collar on the spindlein all cases, because when the bar L is raised by lever M andtemporarily held by hand until the tap is entered in the work thefriction of the clutch on the jogs of the upper wheel instantly occurs,(the spindle be ing in motion,) and, overpowering the spring 1, servesas well to hold the shitting-bar L in check as the setting devices do.Still it is preferred to use them in this modification to hold theclutch out of the lower wheel. at times when the work is of such anature that care and time are required in adjusting the work to the tapand it becomes necessary for the attendant to release his hold of leverM meanwhile. Neither is it important to employ the collar on thetapping-spindle when the catch and the tripping-dog on the lever M areemployed, because at any time after entering the tap in the work andbefore the v spindle takes effect on the clutch the attendant may at hisleisure and while waiting the rise of tap trip the bar by the lever M.

In Figs. 3 and 13 a jog 13 upon the clutchsleeve engages the jogs on thewheels I J; but in the modifications shown in Figs. 4, 10, and 11 theclutch-sleeve is not needed, the key engaging the jogs t'j directly.

I claim- 1. Two spindles geared with the drivingshaft through shafts gg, spur-wheel train f G G, and shaft F, and the single pair ofbevelwheels b F, substantially as described.

2. The combination,with the longitudinallymovable tapping-spindle havingoppositelydriven wheels and an intermediate clutch mounted thereon,of ashifting-bar connected to the clutch and normally operated to engage thesame with one of the wheels, a shiftingbar catch by which the clutch isretained in engagement with the'other wheel, a collar secured to thetapping-spindle, and a catchtripping device arranged in the path oflongitudinal movement of the collar, substantially as described.

3. The combination, with the longitudinallymovable tapping-spindlehaving oppositelydriven wheels and an intermediate clutch mountedthereon and connecting with the upper wheel for advancing the tap in thework and for disconnecting the clutch by the advance of the tap in thework, of the clutchshit'ting bar and spring normally tending and whenrelieved of the friction of the clutch operative to engage said clutchwith the lower wheel to reverse the tap, substantially as described.

4. The combination, with the longitudinallymovable tapping-spindlehaving oppositely driven wheels and an intermediate clutch mountedthereon, of a clutch-shifting bar, a spring connected thereto tending topress the clutch in engagement with one of the wheels, a shifting-barcatch by which the clutch may be retained in engagement with the otherwheel, a collar on the tapping-spindle, and a catch-tripping devicearranged in the path of longitudinal movement of said collar,substantially as described.

5. The combination, with the longitudinallymovable tapping-spindlehaving oppositelydriven wheels and an intermediate clutch mountedthereon and connecting with the upper wheel for advancing the tap in theWork and for disconnectingthe clutch by the advance of the tap in thework, of the clutchshifling bar and spring, setting-catch, and trippinglever and dog, said spring normally tending and when relieved of thefriction of the clutch operative to engage said clutch with the lowerwheel to reverse the tap, substantially as described.

6. The combination, with the longitudinallymovable tapping-spindlehaving oppositelydriven wheels and an intermediate clutch mountedthereon and connecting with the upper wheel for advancing the tap in thework and for disconnecting the clutch by the advance of the tap in thework, of the clutchshitting bar and spring, setting-catch, trippinglever and dog, and the collar on the tap pingspindle, said springnormally tending and when relieved of the friction of the clutchoperative to engage said clutch with the lower wheel to reverse the tap,substantially as described.

In testimony that I claim the foregoing as my invention I have si nedmyname, in presence of two witnesses, this 29th day of September, 1887.

EDIVAR'D N. ANDREIVS.

IVitnesses:

A. W. ALM VIsT, R. ALTHAUS.

